diff --git a/doc/languages-frameworks/rust.section.md b/doc/languages-frameworks/rust.section.md
index 8a1007b7bb8a9..e12bbe02bfb52 100644
--- a/doc/languages-frameworks/rust.section.md
+++ b/doc/languages-frameworks/rust.section.md
@@ -254,7 +254,7 @@ By default, it takes the `stdenv.hostPlatform.config` and replaces components
 where they are known to differ. But there are ways to customize the argument:
 
  - To choose a different target by name, define
-   `stdenv.hostPlatform.rustc.config` as that name (a string), and that
+   `stdenv.hostPlatform.rust.rustcTarget` as that name (a string), and that
    name will be used instead.
 
    For example:
@@ -262,7 +262,7 @@ where they are known to differ. But there are ways to customize the argument:
    ```nix
    import <nixpkgs> {
      crossSystem = (import <nixpkgs/lib>).systems.examples.armhf-embedded // {
-       rustc.config = "thumbv7em-none-eabi";
+       rust.rustcTarget = "thumbv7em-none-eabi";
      };
    }
    ```
@@ -274,10 +274,10 @@ where they are known to differ. But there are ways to customize the argument:
    ```
 
  - To pass a completely custom target, define
-   `stdenv.hostPlatform.rustc.config` with its name, and
-   `stdenv.hostPlatform.rustc.platform` with the value.  The value will be
+   `stdenv.hostPlatform.rust.rustcTarget` with its name, and
+   `stdenv.hostPlatform.rust.platform` with the value.  The value will be
    serialized to JSON in a file called
-   `${stdenv.hostPlatform.rustc.config}.json`, and the path of that file
+   `${stdenv.hostPlatform.rust.rustcTarget}.json`, and the path of that file
    will be used instead.
 
    For example:
@@ -285,8 +285,8 @@ where they are known to differ. But there are ways to customize the argument:
    ```nix
    import <nixpkgs> {
      crossSystem = (import <nixpkgs/lib>).systems.examples.armhf-embedded // {
-       rustc.config = "thumb-crazy";
-       rustc.platform = { foo = ""; bar = ""; };
+       rust.rustcTarget = "thumb-crazy";
+       rust.platform = { foo = ""; bar = ""; };
      };
    }
    ```
diff --git a/lib/systems/examples.nix b/lib/systems/examples.nix
index 79ec4461e4193..6a9427b2d9de7 100644
--- a/lib/systems/examples.nix
+++ b/lib/systems/examples.nix
@@ -59,7 +59,7 @@ rec {
 
   armv7a-android-prebuilt = {
     config = "armv7a-unknown-linux-androideabi";
-    rustc.config = "armv7-linux-androideabi";
+    rust.rustcTarget = "armv7-linux-androideabi";
     sdkVer = "28";
     ndkVer = "24";
     useAndroidPrebuilt = true;
@@ -67,7 +67,7 @@ rec {
 
   aarch64-android-prebuilt = {
     config = "aarch64-unknown-linux-android";
-    rustc.config = "aarch64-linux-android";
+    rust.rustcTarget = "aarch64-linux-android";
     sdkVer = "28";
     ndkVer = "24";
     useAndroidPrebuilt = true;
@@ -207,7 +207,7 @@ rec {
   aarch64-embedded = {
     config = "aarch64-none-elf";
     libc = "newlib";
-    rustc.config = "aarch64-unknown-none";
+    rust.rustcTarget = "aarch64-unknown-none";
   };
 
   aarch64be-embedded = {
diff --git a/pkgs/applications/virtualization/rust-hypervisor-firmware/default.nix b/pkgs/applications/virtualization/rust-hypervisor-firmware/default.nix
index 3441b625c45e6..8b408cc96ed4b 100644
--- a/pkgs/applications/virtualization/rust-hypervisor-firmware/default.nix
+++ b/pkgs/applications/virtualization/rust-hypervisor-firmware/default.nix
@@ -17,8 +17,8 @@ let
   cross = import ../../../.. {
     system = hostPlatform.system;
     crossSystem = lib.systems.examples."${arch}-embedded" // {
-      rustc.config = "${arch}-unknown-none";
-      rustc.platform = lib.importJSON target;
+      rust.rustcTarget = "${arch}-unknown-none";
+      rust.platform = lib.importJSON target;
     };
   };